Writing instrument



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a plan view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a front elevational view shown in an exploded condition; and,

FIG. 9 is a left elevational view shown in an exploded condition. 

The ornamental design for a writing instrument, as shown and described. 